Press for the covering of electrode rods



Dec. 28,- 1948.. K. GLOOR 2,457,459

PRESS FOR THE COVERING OF ELECTRODE RODS Filed June 18, 1945 2Sheets-Sheet 1 INVENTOZ .KAQL GL 00!? ATTOQ/VEYS 28, 1948. K. GLOOR2,457,459 I PRESS FOR .THE COVERING 0F ELECTRODE RODS Filed Julia 1a,1945 j 2 Sheets-Sheet 2 m VENTOE KARL GLOOE Patented Dec. 28, 1948 PRESSFOR' THE COg'gRNG F ELECTRODE- Karl Gloor, Zurich, SwitzerlandApplic'atio'nJune 18-, 1945, Serial No. 600,201 In Switzerland .May31,1944

Section 1, Public Law 690; August 8, 1946 Patent expires May 31, 1964 9Claims.

1 This invention relates to a press for covering or coating electroderods. Several types of presses are known for coating electrodes by meansof a welding mass. Up to the present a continuous process has beencarried out upon presses in which the covering substance is forced,together with the electrode rod, through a nozzle by means of a screwconveyor. With this type of machine only certain compositions of thecovering masses can be treated, as with a screw conveyor only arestricted expulsive pressure can be obtained. For treating coveringmasses which require ahigh expulsdve pressure, hydraulic or mechanicallyoperated piston presses are employed. Such presses, however, have thedrawback that by the withdrawal of the pressing piston and theintroduction of the mass in the pressing cylinder, a disproportionatelylarge amount of time is lost. These stoppages increase the manufacturingcost of electrode rods not only by reason of the reduced output but alsoowing to the fact that smooth operation cannot be obtained during thecompletion and packing of the electrode rods.

An object of this invention is to eliminate the disadvantages of suchpiston presses. The invention consists of a fixed cylinder head and aspecially adjustable cylinder containing the pressing nozzle in which ablocking organ with shuttable passages is arranged which functions as apiston when the holes are closed, and also a filling piston which fitsinto the cylinder..

The appended drawings illustrate as an ex ample one design of theinvention:

Fig. l is a longitudinal section of the press with an adjoininghydraulic distributor, schematically presented, inthefirst stage of theprocess,

Fig. 2 is a section along the line 11-11 in i 1,

Fig. 3 shows the cylinder with the filling piston before the secondstage of the process, after the change-over when the pressing pistoncommences its movement to the left and the filling piston its movementto the right,

Fig. 4 is a section along the line IVIV in Fig. 3,

Fig. 5 is a variation of the pressing cylinder.

The cylinder head 2 is, by means of the thread 4, screwed into the frameI, which contains the 4 pressing nozzle 3. The electrode rod 5 iscoveredwith the mass. The electrode rod 5 movesin the tube 6. The tube 1rests freely on the tube 6. A cup-shaped case 8 rests freely on thecylinder head 2. The former contains at its front end three passages 9and bridges Ill. The case 3 is prevented from turning by the key 12, thelatter resting in the case f3 of the frame I. The key 121's guided inthe slot I 2". A threaded ring IQ is interposed between portionsof theinwardly extending case l3 and of thecase [5; the latter is providedwith a web 15' which-contains passage openings I9 and bridges whichcorrespond to the openings s and bridges ill of the case '8, so that byturning the two cases 8 and 15 relative to each other the passage forthe mass either opens or closes. The pressing piston i6 .is fixed to thec'ase lii. The interior of the case 8 forms the pressing cylinder inwhich the mass is pressed. The left end of the case 15 contains 'a keywhichcan be moved in the key groove 28 of the case 21. The case 2'!contains a cogsegi'nent-R' (Fig. 2) which meshes with the rack 28" andis rotatably mounted in the track's-of the frame I. The case 15 rests inthe cylinder 31, which is cast with the frame I,

so that'by turning the case z'l-o'n the cog seg-" ment 28 .the'c'ase l5and at the same time the bridges 20 are termed, whereby the passage forthe mass either opens or closes. The tube 1 is firmly screwed into thecase 15 by means of the stop and the thread 32', so that the tube 1moves along with the case 15. The filling pasten 33,. which fits intothe case 15, rests freely on the tube 1. The'fill ing piston 33' isfitted with .a piston head 34, which is moved backwards and forwardsinthe filling piston cylinder 35 by apressing fluid. In the pressingpiston there is a ring groove 36 into which fits the head 31 of thereturn bar 38' moving in the framewall 39, and which indirectly controlsthe supplyoi the pressing liquid in front of or behind the piston 16. Acylindrical mass of electrode rod coving material, consisting of twohalves, which has previously been pressed and which serves to cover theelectrodes, is introduced in thespace of the case 15 and pushed by meansof the rfil'ling' piston 33 into the space in front of the passageopening 19. By means of the-pressing piston l6, behind which "thepressingiliquid later described is directed,v the case 15 which isrigidly connected to the pressing piston is pushed to the right, whilstthe filling piston 33' is held fast inits extreme left position by thepressing. liquid :behind the piston head 34'. The mass in the space 40is pressed by this movement through the openings [9 and 9 intothe innerchamber 4| (Fig 3) which is formed in the case-'8. This innerchamber 41has however only'halfthevolume of the'spac'e 40,.sothat hall of the massof the space 40 is displaced through the nozzle opening 3. After thepressing piston l6 has completed its path to the right case 8 and casel5 are in a first operating position as shown in Figure 3 and thefollowing process takes place:

The filling piston 33 is i of the pressing liquid into its extreme rightposi- I I tion. At the same time the case 21 and, through this, the case|5 are turned.by means of the pis-I ton 43 Fig. 1 along the cog-segment28, whereby brought by the reversal the openings I9 and 9 are closed bythe bridges,

20 and I0. At the same time the reversal of the the valve seats beingformed by the walls of these conduits. The female thread 61 is placed onthe thread 59 of the extension of the control piston 53 and is rigidlyconnected to the return bar.

In order to prevent the oscillation of the pressing piston l6 and toobtain an immediate reaction of the latter it is advisable that theforce of the pressing liquid, even in front of the pressing piston be,in the direction of the latter. The difference in pressureof the-liquidbehind and in front of the pressing piston l6 corresponds to thepressing force which is necessary for the expulsion of the mass throughthe nozzle 3. If, for

pressing piston l6 takes place, so that. this lat-.1.

ter moves with the cases l5 and 8 to the left. By

this movement the second half of the mass from the space 4|! which isleft in the space 4| islike a wise pressed through the nozzle 3. Whencase 8 f instance. a pressure of 20 atmospheres is necessary on thepressing piston H3 in order to expel I the mass,,the counterpressurewill be 20 atmospheres with a pump pressure of i atmospheres on the rearside of the pressing piston I6. In

and case have moved to an extreme left posi- V tion they are in a secondoperating position as shown in Figure 1. During the movement of thepressing piston IE to the left a new filling of the mass is enclosed inthe space 40 by means of the filling piston 33, so that after severalreversals of the piston l6 to the right the described process isrepeated.

In Fig. 5 the part of the pressing cylinder which in Fig. 1 is formed bythe parts 8 and 5, is replaced by the cylinder 8|]. A disc 83, provided:with holes 82, serves as blocking organ of the pas- I sage openings 8|,and is firmly connected to the The tube 84 which rotary tube 84 (l inFig. 1). is directed through the filling piston 33 and the fillingpiston cylinder 35 (Fig. 1) to a space behind the latter, is turned byany suitable means which are not specified, whereby the passage openings8| of the cylinder 80 are opened or closed, as the case may be, by thebridges of the disc 83.

As the propulsive speed of the electrode rods remains constant, thespeed of the expulsion of i the mass from the nozzle 3 must be constantand correspond exactly to the propulsive speed of the.

of pressing liquid to the pressing piston I6 is directed by means of themechanical and hydraulic distributor as described below.

A conduit 5| leads from the pump to the. control cylinder 52 whichlatter is formed by a hollow bored in a part of the frame I. From thiscylinder 52 two conduits 54 and 55 lead into the cylinder space of thepressing piston. l6. In the control cylinder is the control piston 53,which is turned by the motor 56 by means of the pu1- leys 51 and 58. Thedistribution of the pressing liquid is effected however not by theturning of the control piston 53 but byits moving on its axis. protrudesover the cylinder 52 is fitted with a thread 59. The end 60 of thisthread worm is placed in the frame I. The conduits 54 and 55 leadinginto the cylinder space of the pressing piston l6 are more or lessopened and closed by a valve having valve bodies formed by the two;control edges 6| and 62. The control edges or valve bodies 63 and 64cause the reversal of the pressing liquid throughthe conduits 65 and'66,

The part of the control piston 53 which" order to ensure this regulationof the counterpressure, the control piston 53 is connected by means ;ofthe female thread 6'! and the return bar 38 to the pressing piston I6.In the position, shown in Fig. 1, the piston I6 is located in its middleposition, and the conduits 65 and 66 are both closed. If the pressingpiston I6 is stationary, the thread 59 screws-with the control piston 53by the turning of the latter into the female thread,,whereby the controlpiston 53 is shifted along'its axis to the left. In this way the refluxof the pressing liquid is permitted, bythe control edge- .64 openingconduit 66, so that the pressure is reduced on that side of the pressingpiston fedbyconduit 55 before reaching the pressing piston l6, while atthe'same time the pressure behind the pressing piston l6 is increased bythe control edge 6| further opening conduit 54 and closing conduit65.

-By'reason of the excessive pressure which is now developed behind thepressing piston |6 the latter isshifted to the right, whereby thecontrol piston53 is lead back by means of the return bar 38 and thefemale thread 61 to the right, so

that the control 'edge 64 again closes the reflux through the conduit55.

The process would be repeated along thewhole path of the pressing pistonl6. Owing to the inertia of the apparatus, however a similar movement isproduced in the pressing piston. The rotary-speed of the control piston53 therefore determines the propulsive speed of the pressing piston- 16,which is dependent upon the'nature and sizeof the electrodes. For themanufacture of various types and sizes of electrode rods it must bepossible to regulate the number of revolutions of the control piston 53,and this is suggested by the graduated discs or step cone pulleys 51 and58. As the pressing'piston l6 operatesin both directions, the rotatorydirection of the control piston mustbe reversible.

The following device, which is schematically presented, servesto'control the piston 43, which effects the opening and closing of thepassage openings in'the cylinder and of the filling piston 34," and alsoserves to switch over the motor 56.

A conduit (8 leads from the pump 5|l-to the controlcylinder 1|, inwhichthe control piston 72 rests in a position where it is free to movealongits' own axis. The piston 12 is moved by means of the bar '13,which is fixed to the female.

thread 61. The bar '73 knocks against the stops Hand 15, which.are'fixed to the ends of'the piston 12. Two conduits l6 and TI lead fromthecylinder H, to the cylinder E8, in which thepiston-:43'moves, and tothe filling piston cylinder 35. The 'conduits serve alternatelyaspressaugust ing and return conduits, in connection with the The fillingmovement and the expulsion of the.

mass, likewise the opening and closing of the passage openings, could beworked mechanically instead of by hydraulic power without sacrificingthe principle of the invention.

I claim:

1. A press for coating electrode rods, comprising a fixed cylinder headcontaining a pressing nozzle, a cup-shaped case having an inner chamberdirected toward said nozzle for transmitting a coating mass to saidnozzle, and further having openings formed in the front end thereof,another case having a web located adj acent the firstmentioned case andhaving openings formed therein and adapted to aline with the openings ofthe first-mentioned case, means connected with the second-mentioned casefor rotating it relatively to the first-mentioned case to bring theopenings of the two cases in and out of alinement, means engaging saidcases to cause them to move jointly longitudinally and a filling pistonmovable within the second-mentioned case, whereby relative longitudinalmovement between said filling piston and the second-mentioned case willpress the coating mass into said inner chamber when the openings are inalinement.

2. A press in accordance with claim 1, wherein the space for the coatingmass within the secondmentioned case is approximately twice as large asthe space for the coating mass in said inner chamber adjacent saidnozzle.

3. A press for coating electrode rods, comprising a fixed cylinder headcontaining a pressing nozzle, a cup-shaped case having an inner chamberdirected toward said nozzle for transmitting a coating mass to saidnozzle, and further having openings formed in the front end thereof,another case having a web located adjacent the firstmentioned case andhaving openings formed therein and adapted to aline with the openings ofthe first-mentioned case, means connected with the second-mentioned casefor rotating it relatively to the first-mentioned case to bring theopenings of the two cases in and out of alinement, a member connectedwith the second-mentioned case and contacting the first-mentioned caseto enable the two cases to reciprocate jointly in a longitudinaldirection, a pressing piston firmly connected with the second-mentionedcase, means actuating said pressing piston and a filling piston movablewithin the second-mentioned case, whereby relative longitudinal movementbetween said filling piston and the second-mentioned case will press thecoating mass into said inner chamber when the openings are in alinement.

4. A press for coating electrode rods, comprising a fixed cylinder headcontaining a pressing nozzle, a cup-shaped case having an inner chamberdirected toward said nozzle for transmitting a coating mass to saidnozzle, and further having openings formed in the front end thereof,another case having a web located adjacent the firstmentioned case andhaving openings formed therein and adapted to aline with the openings ofthe first-mentioned case, means connected with the second-mentioned casefor rotating it relatively to the first-mentioned case to bring theopenings of the two cases in and out of alinement, a filling pistonmovable within the secondmentioned case, means engaging said cases tocause them to move jointly longitudinally in the direction toward saidfilling piston, and: means maintaining said filling piston in itsposition within the second-mentioned case during said. v joint movementof the two cases, whereby said filling piston absorbs thecounterpressure: of the coating mass which latter is pressed throughsaidopenings and said inner chamber toward said nozzle.

5. A press for coating electrode rods, comprising in combination with apressing nozzle through which an electrode rod is movable at a constantspeed, a cup-shaped case having an inner chamber directed toward saidnozzle for transmitting. a coating mass to said nozzle, and furtherhaving openings formed in the front end thereof, another case having aweb located adjacent thefirstmentioned case and having openings formedtherein and adapted to aline with the openings of the first-mentionedcase, means connected with the second-mentioned case for rotating itrelatively to the first-mentioned case to bring the openings of the twocases in and out of alinement, means interengaging said cases to permit,them to reciprocate jointly longitudinally, means. transmitting anoperating fluid to one of said cases to cause the joint longitudinalreciprocating movement thereof, a filling piston movable within thesecond-mentioned case, whereby relative longitudinal movement betweensaid filling piston and the second-mentioned case will press the coatingmass into said inner chamber when the, openings are in alinement, andmeans connected with the last mentioned means for regulating. the;transmission of saidoperating fluid andc'omprisa ing a. valve regulatingthe amount and direction of flow of said operating fluid and including aplurality of valve seats, a corresponding number of'valve bodiescooperating with said valve seats, a single shaft carrying said valvebodies and having a threaded. portion, a member supporting said shaftand having threads meshing with the. threaded portion thereof, and meansrotating said shaft,.whereby the transmission of the operating fluid andthe speed of movement of said cases i may be correlated to the speed ofthe electrode rod through said pressing nozzle.

6. A press for coating electrode rods, comprising a fixed cylinder headcontaining a pressing nozzle, a cup-shaped case having an inner chamberdirected toward said nozzle for transmitting a. coating mass to saidnozzle, and further hav ing openings formed inthe front end thereof,another case having a web located adjacent the first-mentioned case andhaving openings formed therein and adapted to aline withthe openings ofthe first-mentioned case, means connected with the second-mentioned casefor rotating it relatively to the first-mentioned case to bring theopenings of the two cases in and out of alinement, means interengagingsaid cases to permit them to reciprocate jointly longitudinal-1y, apressing piston firmly connected with the second-mentioned case, meanstransmitting an operating fluid to said pressing piston to causethejoint longitudinal reciprocatory movement of the two cases, a fillingpiston movable within the second-mentioned case, whereby relativelongitudinal movement between said filling piston and the secondmentioned case will press the coating mass into said inner chamber whenthe openings are in alinement, and means connected with thelast-mentioned means for regulating the transmission of said operatingfluid and comprising a control cylinder having a plurality of valveseats, for regulating the amount and direction of flow of said operatingfluid and a control piston reciprocable within said control cyl- 1 inderand having a corresponding number of valve bodies cooperating with saidvalve seats.

- '7. A press for coating electrode rods, comprising a fixed cylinderhead containing a pressing nozzle, a cup-shaped case having an innercham- 1 ber directed toward said nozzle for transmitting a coating massto said nozzle, and further having openings formed in the front endthereof, another case having a web located adjacent the first-mentionedcase and having openings formed 1 therein and adapted to aline with theopenings Of' the fhst-mentionedcase, means connected with thesecond-mentioned case for rotating it relatively to the first-mentionedcase to bring the openings of the two cases in and out of alinement,means interengaging said cases to permit them to reciprocate jointlylongitudinally, a pressing piston firmly connected with thesecond-mentioned case, means transmitting an operating fluid to saidpressing piston to cause the joint longitudinal reciprocatory movementof the two cases, a filling piston movable within the second-mentionedcase, whereby relative longitudinal movement between said filling pistonand the second mentioned case will press the coating mass into saidinner chambers when the.

piston reciprocable within said control cylinder, and having acorresponding number of valve bodies cooperating with said valve seats,a threaded shaft firmly connected with said con-*. trol piston andmovable therewith, a member. supporting said shaft and having threadsmeshing with the threads of the shaft, and means} rotating said controlpiston and shaft.

8. A press for coating electrode rods, comprising a fixed cylinder headcontaining a pressing nozzle, a cup-shaped case having an inner cham-.

ber directed toward said nozzle for transmitting a coating mass to saidnozzle, and further having openings formed in the front .end thereof,

another case having a web located adjacent the first-mentioned case andhaving openings formed therein and adapted to aline with the openings ofthe first-mentioned case, means connected with the second-mentioned casefor rotating it relatively to the first-mentioned case to bring theopenings of the two cases in and out of aline ment, means interengagingsaid cases to permit them to reciprocate jointly longitudinally, apressing piston firmly connected with the secondmentioned case, meanstransmitting an operating fluid to opposite sides of the pressing pistonwith different pressures, a filling piston movable within thesecond-mentioned case, whereby relative longitudinal movement betweensaid filling piston and the second-mentioned case will press the coatingmass into said inner chamber when the openings are in alinement, andmeans con nected with the last-mentioned means for regulating thetransmission of said operating fluid coating and comprising a controlcylinder having a plurality of valve seats, for regulating'the amountand direction of fiow of said operating fluid, a control pistonreciprocable within said control cylinder and having a correspondingnumber of valve bodies cooperating with said valve seats, a threadedshaft firmly connected with said control piston and movable therewith, amember supporting said shaft and having threads meshing with the threadsof the shaft, means rotating said control piston and shaft, and meansoperatively connecting the shaft-supporting member with said pressingpiston, whereby the rotation of said shaft and said control pistondetermines the path of movement of said pressing piston and the casesconnected therewith.

9. A press for coating electrode rods, comprising a fixed cylinder headcontaining a pressing 1 nozzle, a cup-shaped case having an'innerchamber directed toward said nozzle for transmitting a coating mass tosaid nozzle, and further having openings formed in the frontend'thereof, another case having a web located adjacent thefirst-mentioned case and having openings formed therein and adapted toaline with the openings of the first-mentioned case, means connectedwith the second-mentioned case for rotating it relatively to thefirst-mentioned case to bring the openings of the two cases in and outof alinement, means interengaging said cases to permit them, toreciprocate jointly longitudinally, a pressing piston firmly connectedwith the second-mentioned case, means transmitting an operating fluid tosaid pressing piston to cause the joint longitudinal reciprocatingmovement of the two cases, a filling piston movable within thesecond-mentioned case, whereby relative longitudinal movement betweensaid filling piston and the second-mentioned case will press the massinto said inner chambers when the openings are in alinement, and meansconnected with the last-mentioned means for regulating the transmissionof said operating fluid and comprising a control cylinder having aplurality of valve seats, for regulating the amount and direction offiow of said operating fluid, a control piston reciprocable within saidcontrol cylinder and having a corresponding number of valve bodiescooperating with said .valve' seats, a threaded shaft firmly connectedwith" said control pistonv and movable therewith, a member supportingsaid shaft and having threads meshing with the threads of the shaft,means rotating said control piston and shaft, and means connected withthe last-mentioned means for varying the number of revolutions of thecontrol piston depending upon the type and size of the electrode rod tobe produced.

KARL GLOOR.

nnrnnnNcas crrnn The following references are of record in the file ofthis patent:

